To weaken the negative influences of vertical joints on the flexural performance of fabricated hollow cross-grid floor slabs, the experiments and analyses on the fabricated floor strips with different vertical joints were carried out. Based on the influence factors including the number, the location, the width and the roughness of the joints, one cast-in-situ floor strip and four fabricated floor strips were designed. Through the static load tests, the deflection, the cracks development, the flexural bearing capacity, the stress, and the strain of steel and concrete were obtained. The experimental results demonstrate that the flexural performance of the fabricated floor strips can be improved to some extend by optimizing the design of the joint construction. The strength and the stiffness of the fabricated specimens approach those of the cast-in-situ members when the joints locate out of the main loaded areas. The reliable connections of the steel bars in the joints ensure the effective force transmission and restrict the development of the cracks on concrete surfaces. In the calculation of the flexural bearing capacity of the hollow cross-grid floor slabs with vertical joints, the effective compression flange width can be considered according to the code for design of concrete structures.